Gerald Navratil, a professor of plasma physics at Columbia, on the pursuit by start-ups for clean, unlimited power. Page A6.

'If you can keep playing tennis when somebody is shooting a gun down the street, that's concentration. I didn't grow up playing tennis at the country club' Tennis star Serena Williams, on the run ...

A Republican’s IVF-Ban Amendment Is the Last Thing the GOP Needs Right Now ...

Lucy Spraggan "is grumpy", R-Patz wants to break our hands and Taylor Swift hints who her song is about - it's celebrity quotes of the day ...

Dr. Wesner Junior Jacotin, a critical care physician in Haiti, where a surge in gang violence over the past two weeks has led international aid organizations to rethink their staffing levels. Page A1.